Yamaha C3 regulation

[llafargue]

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I have moved the jacks forward (out, toward the escape side) and the
bump is much more acceptable.  It seems I can move them out a lot
without them "cheating", even with all of the lube.  It was hard to
measure/feel until I did a whole section, and then actually played the
piano.  It is much improved.  So following the exact jack alignment
wasn't best in this case, given the geometry.  I will look at spread and
look at why the knuckle core and jack aren't perfectly in line.  There
are also a couple of articles on this I need to review.  I appreciate
all of the ideas.  I plan to study this further.  
 
Lance Lafargue, RPT
LAFARGUE PIANOS
New Orleans Chapter, PTG
985.72P.IANO
llafargue@charter.net
 
-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
llafargue
Sent: Wednesday, July 28, 2004 1:58 PM
To: 'College and University Technicians'
Subject: RE: Yamaha C3 regulation
 
 
I will plug these ideas in. If anything, the knuckle core is angled
toward the key front/player, when the jack is straight up.   The angle
of knuckle core and back of jack are not exact.  Close, but not exact.
I'll be back.
 
Lance Lafargue, RPT
LAFARGUE PIANOS
New Orleans Chapter, PTG
985.72P.IANO
llafargue@charter.net
 
-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
llafargue
Sent: Wednesday, July 28, 2004 8:17 AM
To: 'College and University Technicians'
Subject: RE: Yamaha C3 regulation
 
I'm headed back to the piano to check more carefully.  The backchecks
aren't doing it.  On after touch; I tried raising the glide bolts to see
if that affected it, but no. Thanks, I'll post later today.  
 
Lance Lafargue, RPT
LAFARGUE PIANOS
New Orleans Chapter, PTG
985.72P.IANO
llafargue@charter.net
 
-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
llafargue
Sent: Tuesday, July 27, 2004 9:23 PM
To: caut@ptg.org
Subject: Yamaha C3 regulation
 
List,
 I have a customer with a Yamaha C3 that's 4 years old.  It is like new,
very slight knuckle/hammer wear, but really good shape.  I have
regulated it and everything seems great except that the let-off bump
feel seems excessive and I can't figure out why, on this C3.  I have
lubed everything, knuckles with Teflon, McLube to all key pins,
whippen/jack tops, etc, but when the jack lets off, you really feel it.
Also, when playing pianissimo, at the point of let-off, there is a
definite wall that you hit and it actually prevents some notes from
releasing.  I am wondering what aspects of regulation affect this.  Or
is there something else I am missing?  Let-off is about 1/8" to 1/16"
graduated, drop a little more than that, checking is close; rep springs
are not too strong.  Knuckle and jack top shape seem normal.  Thanks.   
 
Lance Lafargue, RPT
LAFARGUE PIANOS
New Orleans Chapter, PTG
985.72P.IANO
llafargue@charter.net
 

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